Operations

本文描述对map的各种操作。

概述

fluentcpp Overview of std::map’s Insertion / Emplacement Methods in C++17

Go ahead and try out the C++17 emplacement / insertion methods. They offer a tangible improvement in terms of expressiveness and code safety.

Here are examples of code using them.

stackoverflow insert vs emplace vs operator[] in c++ map

TODO Bug

stackoverflow Calling std::map::emplace() and avoiding unnecessary constructions

Warning: In some implementations, option B constructs the pair even if the key is not unique, which is probably a bug. – Lightness Races in Orbit Dec 29 '13 at 23:37

stackoverflow Does map move-insertion guarantee that elements are or are not moved from?